/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/Stack/NiagaraStackGraphUtilities.h
Helper to add a new pin to a ParameterMapBaseNode, and conditionally add a new parameter to the underlyingUNiagaraGraphif it does not yet exist.
namespace FNiagaraStackGraphUtilities { void FNiagaraStackGraphUtilities::AddNewVariableToParameterMapNode ( UNiagaraNodeParameterMapBase * MapBaseNode, bool bCreateInputPin, const [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) & NewVariable ) }